Replacing the Atlant refrigerator compressor relay: a complete guide

A sudden stop of the motor-compressor in the refrigerator Atlant is always stressful, because it is under threat there are food supplies. Most often, the reason lies not in a burnt-out engine, but in the failure of the start-up relay, which is responsible for starting the unit. Replacing this part is one of the most common procedures in the repair of household appliances with your own hands, which does not require complex equipment.

Before taking active steps, you must clearly understand the structure of the unit and observe pre-stop measures. Electrical safety here comes first, since the work is carried out with conductive elements. In this article we will analyze a step-by-step dismantling algorithm, fault diagnosis and the nuances of installing a new component for various series of refrigerators.

It is important to immediately note that the success of the operation depends on correct diagnosis. If you hear clicks, but the compressor does not start, or it hums for several seconds and turns off, the problem with a 90% probability lies in the trigger mechanism. In old Atlant models, relays of the P-100 series were often installed, which are prone to contact sticking due to burnout of the graphite layer.

Principle of operation and device starting relay

A starting protection relay is an electromechanical device that supplies a current pulse to the starting winding of the engine at the moment of start. As soon as the compressor rotor reaches the required speed, the device opens the starting winding circuit, leaving only the working winding active. Models Atlant often use induction or posistor relays, each of which has its own design features.

Inside the case there is a coil, a movable core and a contact group. When voltage is applied, current flows through the coil, creating a magnetic field that draws in the core and closes the contacts. If the engine does not start in a split second, the current in the circuit increases sharply, and the thermal protection (bimetallic plate) opens the circuit, preventing the windings from burning out. Thermal protection is a critical element, without which operation of the refrigerator is impossible.

Some models the relays are combined with a thermal release in a single housing, others are made separately. Refrigerators Atlant are characterized by a layout where the relay is attached directly to the three terminals of the compressor. Understanding this principle will help you avoid assembly errors when the phasing or assignment of contacts is mixed up.

⚠️ Attention: Never try to start the compressor bypassing the relay by connecting the contacts directly. This can lead to instantaneous burnout of the windings or a fire due to the lack of overload protection.

Fault diagnosis before disassembly

Before removing the relay, you should make sure that the problem is in it, and not in the compressor or wiring itself. Primary diagnosis is carried out visually and auditorily. If, when you turn on the refrigerator, you hear a quiet hum lasting 3-5 seconds, followed by a characteristic click and silence, this is a classic symptom of a malfunction of the starting mechanism or jamming of the compressor.

Remove the back cover of the refrigerator at the bottom where the motor is located. Inspect the wires going to the compressor. If traces of melting of the insulation are visible, blackening of the plastic or a burning smell is felt, this indicates overheating of the contacts. Fusing of the housing the relay is a sure sign that the part requires immediate replacement.

You can also gently shake the removed relay (after disconnecting the refrigerator from the network). If knocking or rattling is heard inside, it means the mechanical part is damaged. In posistor models, the ceramic element itself is often destroyed, which can be seen when the case is opened.

• 🔌 The refrigerator hums for 5-10 seconds and clicks, but does not start.
• 🔥 The relay case has traces of soot, melting or deformation.
• 🔨 When when shaking the relay, a sound is heard from broken internal parts.
• ⚡ The compressor is hot and the relay is cold (or vice versa, the relay is hot).

If there is no visual damage, you will need a multimeter to test the contacts. However, in most cases, for refrigerator owners Atlant an external inspection is sufficient, since the malfunction is clearly manifested.

Necessary tools and preparation

To successfully complete the replacement, you do not need a complex professional tool. A minimal set is enough, which most home craftsmen can find. The main thing is to provide yourself with convenient access to the bottom of the refrigerator and good lighting of the work area.

Before starting work, be sure to disconnect the refrigerator from the power supply. Unplug the plug from the outlet to prevent electric shock. Move the unit away from the wall, allowing access to the rear wall. If the floor is slippery, place a piece of cardboard or fabric under the legs of the refrigerator so as not to damage the coating when moving.

You will need the following tools:

• 🔧 Phillips or flathead screwdriver (depending on the type of screws on the casing).
• 🔪 A stationery knife or thin awl (for neat removing the fixing brackets).
• 🧤 Gloves (it is recommended to use dielectric or thick work gloves).
• 📱 Smartphone (for photographing the wiring diagram before removal).

Using a smartphone for photography is important life hack. Even if you are sure that you will remember which wire is connected where, a photograph will be your insurance against assembly errors. This is especially true for models with a remote capacitor or additional sensors.

Step-by-step instructions for removing the relay

The process of dismantling the relay on refrigerators Atlant standardized, but has its own nuances depending on the series. First, remove the protective plastic casing covering the compressor. It is usually secured with latches or screws. Be careful, the plastic becomes brittle over time and can crack if handled carelessly.

After removing the casing, you will see a black cylindrical or cubic compressor. On its side (usually on the right side when viewed from behind) there is a block to which the wires go. This is the relay you are looking for, often combined with a capacitor and a thermal release. Carefully bend back the metal retaining brackets or plate that presses the relay to the compressor housing.

Disconnect the wires. In some models Atlant the wires are inserted tightly into the relay terminals and may oxidize. Do not pull them sharply by the insulation, so as not to break them. It is better to rock the terminal from side to side, gradually pulling it out. If the contacts are very stuck, you can use pliers, but act carefully so as not to damage the compressor terminals.

Now the most important action: remove the relay itself from the compressor terminals. It is held in place by its tight fit and weight. Take the relay by the body (not by the wires!) and lift it down with light rocking movements. If the relay cannot be removed, do not use excessive force - the fixing frame may be in the way, which must first be removed.

⚠️ Attention: The compressor terminals are made of brittle metal. A sudden movement or distortion when removing the relay can break the tubes, which will lead to depressurization of the system and expensive repairs with refilling with freon.

After removal, inspect the seat on the compressor. There should be no traces of moisture, oil or carbon deposits. If the contacts on the compressor terminals are oxidized, they can be carefully cleaned with fine sandpaper or a needle file, but very delicately.

What to do if the relay is stuck?

If the relay cannot be removed, it may have become stuck due to high temperature. Try slightly warming the relay body with a hairdryer (without overheating!) or use WD-40 penetrating lubricant, applying it carefully to the joint, avoiding getting inside the compressor.

Compatibility table and relay markings

When purchasing a new part, it is important to know the exact markings. Refrigerators Atlant equipped with different types of compressors (Danfoss, Secop, Atlant, Frigidaire), and the relays for them may differ. Installing an unsuitable relay will either prevent the engine from starting or cause it to burn out quickly.

There is always a marking on the body of the old relay. Look for a code starting with the letters RT (start-up thermal) or P-100, P-6, LS-17B. The type of refrigerant for which the system is designed is also important, although for the relay itself this is secondary, the main thing is the current characteristics.

Below is a correspondence table for the most common relays for refrigerators Atlant:

If you have not found an exact analogue, you can choose a universal relay. To do this, you need to know the power of your compressor, indicated on the nameplate (sticker on the motor housing). Universal relays They often come complete with a set of adapters, which simplifies installation on different types of terminals.

Installing a new relay and checking operation

Installation is carried out in the reverse order of removal. Take the new relay and make sure it is oriented correctly. The case usually has a marking UP (top) or an arrow pointing up. Incorrect orientation will result in the mechanism not working correctly.

Attach the relay to the three terminals of the compressor. It should fit tightly, without distortion. Make sure that the leads are fully seated in the sockets. Next, attach the retaining bracket or plate that holds the relay in place. After this, connect the wires to the terminals according to the photograph or color marking taken earlier.

Usually the connection diagram is as follows: two wires go to the thermal protection (if it is separate) and one to the starting winding. In combined relays, the wires are inserted into the corresponding sockets on the housing. Check the reliability of the connections: the wires should not dangle, the terminals should sit tightly.

After assembling all electrical connections, but before installing the protective casing, turn on the refrigerator. Listen carefully. A characteristic click should be heard and the compressor should start with a smooth hum. If the startup was successful, let the unit run for 5-10 minutes, monitoring the temperature of the relay housing (it may get slightly warm, but should not smoke).

If everything went well, replace the protective plastic casing and screw it on. Adjust the legs of the refrigerator for stability. At this point, the replacement process can be considered complete.

⚠️ Attention: If, after replacing the relay, the compressor hums but does not start, or the machine in the panel knocks out, immediately turn off the power. Probably, the problem is deeper (compressor jamming, interturn short circuit) and requires professional intervention.

Is it possible to repair an old relay rather than changing it?

Theoretically, if the relay is inductive (RT-100), you can try to clean the contacts from carbon deposits or replace the burnt-out nichrome spiral. However, this is a temporary measure. The reliability of such repairs is low, and after a short time (the malfunction) will recur. For a refrigerator where food is stored, it is safer and cheaper to buy a new relay than to risk damage to food and the compressor.

Why does the relay burn out? Main reasons.

Frequent causes of failure: power surges in the network, wear of the mechanism from frequent on/off, poor contact in the terminals leading to heating, or a malfunction of the compressor itself (difficult starting). Also, the relay can burn out if the refrigerator is installed close to the wall and there is no ventilation, causing overheating.

Where to buy a relay for the Atlant refrigerator?

Original spare parts and high-quality analogues can be bought in specialized stores of spare parts for household appliances, on radio markets or in trusted online stores. Avoid buying too cheap no-name analogues without markings, since their service life is unpredictable.

How much does it cost to replace a relay at a service center?

The cost consists of the price of the spare part and the work of the technician. The part itself is inexpensive (from 500 to 1,500 rubles depending on the model), but calling a technician and diagnostics can cost a comparable amount. Therefore, independent replacement is economically feasible.